1. Postdoctoral Research Associate, Dept. of Civil Engineering, Univ. of Nebraska–Lincoln, Lincoln, NE.
2. Project Manager, SK Engineering and Construction, Seoul, Republic of Korea.
3. Associate Professor, Dept. of Civil Engineering, Univ. of Seoul, Seoul, Republic of Korea.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Nebraska–Lincoln, Lincoln, NE.